NPK Fertilizer Rate Calculator
Calculate the exact amount of fertilizer needed for your crops based on soil test results and target nutrient requirements.
Frequently Asked Questions
Our calculator provides professional-grade estimates based on standard agricultural formulas. For maximum accuracy, we recommend using recent soil test results as inputs. The calculations account for nutrient requirements per unit area and fertilizer composition.
For most crops, testing soil at least once per year before planting season is recommended. For intensive cultivation or problem soils, testing every 6 months may be beneficial. Always test after making significant amendments to monitor changes.
Yes, but you’ll need to know the exact NPK percentage of your organic fertilizer (usually listed on the packaging). Select “Custom Ratio” and enter the values. Note that organic fertilizers typically have lower NPK values than synthetic ones, so you’ll need larger quantities.
Nitrogen (N) promotes leafy growth, Phosphorus (P) supports root development and flowering, while Potassium (K) enhances overall plant health and disease resistance. The right balance depends on your crops and soil conditions.